Portable power pack



FIG. 1 is a top perspective view of an embodiment of a portable power pack showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a first end elevational view thereof; and,

FIG. 7 is a second end elevational view of the design.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portable power pack, as shown and described. 